Doosan D50S-5 Operation & Maintenance Manual page 84

Fault Light Fault Light
Foot Pedal Foot Pedal
Air Air Cleaner Cleaner
Engine speed is monitored by the SECM through a Engine speed is monitored by the SECM through a
variable reluctance (VR) sensor. Intake manifold air variable reluctance (VR) sensor. Intake manifold air
temperature and absolute pressure is monitored temperature and absolute pressure is monitored
with a (TMAP) sensor. The MI-04 is a drive by wire with a (TMAP) sensor. The MI-04 is a drive by wire
(DBW) system connecting the accelerator pedal to (DBW) system connecting the accelerator pedal to
the electronic throttle through the electrical harness, the electronic throttle through the electrical harness,
mechanical cables are not used. A throttle position mechanical cables are not used. A throttle position
sensor (TPS) monitors throttle position in relation to sensor (TPS) monitors throttle position in relation to
the the accelerator accelerator
feedback. Even engine coolant temperature and feedback. Even engine coolant temperature and
adequate oil pressure is monitored by the SECM. adequate oil pressure is monitored by the SECM.
The SECM controller has full adaptive learning The SECM controller has full adaptive learning
capabilities, allowing it to adapt control function as capabilities, allowing it to adapt control function as
operating conditions change. Factors such as operating conditions change. Factors such as
Operation Section Operation Section
Basic Troublesh Basic Troubleshooting
The EMS systems are equipped with built-in fault The EMS systems are equipped with built-in fault
diagnostics. diagnostics.
displayed by the Malfunction Indicator Lamp (MIL) displayed by the Malfunction Indicator Lamp (MIL)
and are covered in the Advanced Diagnostics and are covered in the Advanced Diagnostics
Key switch Key switch
Main Main
PWR PWR
Relay Relay
APP APP
Coolant Line Coolant
DBW DBW Throttle
Ignition Ignition Coil Coil
Muffler Muffler
pedal pedal position position sensor sensor
ooting
Detected Detected system system faults faults can
EMS EMS
LP Fuel LP Fuel Line
Fuel Fuel Lock
Fuel Fuel Filter Filter
Converter Converter
Line
Vacuum Vacuum
Mixer Mixer
Line Line
Throttle
TPS TPS
TMAP TMAP
ambient ambient temperature, temperature,
component wear, clogged air filter, and other component wear, clogged air filter, and other
operating variables are compensated. operating variables are compensated.
(APP) (APP)
83 83
checks that should be made before referring to the checks that should be made before referring to the
can be be Advanced Diagnostics section, if engine or drivability Advanced Diagnostics section, if engine or drivability
problems are encountered. problems are encountered.
Locating a problem in a propane engine is done Locating a problem in a propane engine is done
Line
Lock
Coolant Temperature Coolant Temperature Sensor
fuel fuel variations, variations,
SECM SECM
Sensor
ignition ignition